book Maths Puzzle Numerical Ability

How do we solve (2u+4)(u+1)

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okay, i am in algebra 2, but we are reviewing algebra 1, and our teacher dumped this packet on us and told us it was due wednsday, i dont remember almost anything, the directions s solve:
20 over x = 20 over x-4 + 4 over x

please show work

solve:
a over a+1 + 2a+4 over a^2-3a-4 = 2 over a-4

show work please

thanks